For the first time in world WATER PROOF WELDING MACHINE with replacement only by GREAT. SMT surface mount design on PCBs, with advance craft. With good protection of under voltage, overvoltage and over current, it makes machine safe and reliable. Self-adaptive power switch, wide range from 110V to 280V. CC feature, with stable arc. Modular functional unit, which highly enhance machine reliability. Next generation IGBT, with high stability. With advanced high efficiency inverter technique 30KHz, high working frequency,eneygy saving and environment protection. Welding cable can be lengthened to 500 meters, and welding performance is stable. Effectively resolves the voltage fluctuation problems so can be used generator during outdoor welding works. Suitable for using acid electrode, basic electrode and high strength electrode, etc. Built-in VRD protection, meet CE requirement. With five proof industry design, using life long, working stable and reliable in kinds of adverse circumstances."